Emergency lighting centralized power supply circuit based on digital power supply management

Abstract

The utility model provides an emergency lighting centralized power supply circuit based on digital power supply management. The emergency lighting centralized power supply circuit comprises a power supply module, a signal detection module and a digital control module. The power supply module comprises a main power unit and a standby power unit connected with the output end of the main power unit; the signal detection module is respectively connected with the main power unit and the standby power unit and is used for detecting electrical parameters of the main power unit and the standby power unit; the digital control module is respectively connected with the output end of the signal detection module, the main power unit and the standby power unit; the main power unit comprises a first switch tube group, and the standby power unit comprises a second switch tube group; and the digital control module switches the power supply states of the main power unit and the standby power unit and adjusts the electrical parameters of the main power unit and the standby power unit by controlling the conduction state of the first switch tube group and / or the second switch tube group based on the electrical parameters detected by the signal detection module. According to the utility model, global digital control is adopted, perfect detection and judgment functions are provided, circuit power conversion can be realized, rapid switching between the main power unit and the standby power unit can be controlled, and reliable operation of the circuit is ensured.

Description

Technical Field

[0001] This utility model relates to a centralized power supply circuit for emergency lighting based on digital power management, belonging to the technical field of emergency lighting equipment. Background Technology

[0002] Emergency lighting centralized power supplies are crucial equipment for ensuring fire safety and play an irreplaceable role in various buildings, facilities, and industrial sites. Currently, mainstream products on the market use multiple analog integrated circuits for power conversion, combined with a microcontroller to manage the various circuits. These circuit solutions generally suffer from the following problems: seamless switching between main and backup power is difficult; significant delays occur to ensure reliable switching between circuits; and voltage drops during switching can cause flickering lights, resulting in a poor user experience. Furthermore, battery charging and discharging circuits often use two independent sets of hardware, increasing hardware costs.

[0003] Furthermore, although these circuit solutions also include microcontrollers that can control the circuit through programs, microcontrollers often only sample the output voltage and current and do not detect other key signals within the power conversion circuit. Therefore, they have many shortcomings in circuit fault detection and diagnosis, resulting in high maintenance costs in the later stages. In addition, different application scenarios, such as different emergency times, require different charging current curves for battery packs with different capacities. Such customization often requires hardware modifications and the development of many power supplies, which increases product maintenance costs.

[0004] In view of this, it is indeed necessary to improve the existing centralized power supply for emergency lighting in order to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an emergency lighting centralized power supply circuit based on digital power management. It adopts global digital control to realize circuit power conversion and can control the rapid switching between the main power unit and the backup power unit to ensure reliable circuit operation.

[0006] To achieve the above objectives, this utility model provides an emergency lighting centralized power supply circuit based on digital power management, comprising:

[0007] The power module includes a main power unit and a backup power unit connected to the output of the main power unit to supply power to the lighting load;

[0008] The signal detection module is connected to the main power unit and the backup power unit respectively, and is used to detect the electrical parameters of the main power unit and the backup power unit.

[0009] The digital control module is connected to the output of the signal detection module, the main power unit, and the backup power unit, respectively.

[0010] The main power unit includes a first switch group that controls its conduction, and the backup power unit includes one or more parallel second switch groups that control its conduction. The digital control module switches the power supply status of the main power unit and the backup power unit and adjusts their electrical parameters by controlling the conduction status of the first switch group and the second switch group based on the electrical parameters detected by the signal detection module.

[0011] Optionally, the first switching transistor group includes a first switching transistor and a second switching transistor connected in series, and the main power unit also includes a resonant circuit and a transformer connected between the source of the first switching transistor and the drain of the second switching transistor.

[0012] Optionally, the backup power unit includes a backup power circuit and a battery cell that is charged / discharged through the backup power circuit. The backup power circuit includes a third switch and a fourth switch connected in series, as well as a first inductor and a storage capacitor connected between the source of the third switch and the drain of the fourth switch. The third switch and the fourth switch constitute a second switch group.

[0013] Optionally, the electrical parameters include the input / output voltage and / or input / output current of the main power unit. Based on the detected electrical parameters of the main power unit, the digital control module drives the first and second switching transistors to conduct alternately, so that the main power unit supplies power to the lighting load; or, drives the third and fourth switching transistors to conduct alternately, so that the backup power circuit supplies power to the lighting load.

[0014] Optionally, the electrical parameters also include the voltage and / or current of the battery cell. When the main power unit supplies power to the lighting load, the digital control module drives the third and fourth switching transistors to alternately turn on or off based on the detected voltage and / or current of the battery cell, so that the main power unit and the backup power circuit can charge or stop charging the battery cell.

[0015] Optionally, the main power unit also includes an output capacitor connected to the secondary side of the transformer, a backup power circuit connected in parallel with the output capacitor, the drain of the third switching transistor connected to the positive terminal of the output capacitor, the gate connected to the output terminal of the digital control module, and the source connected to the drain of the fourth switching transistor; the gate of the fourth switching transistor connected to the output terminal of the digital control module, and the source connected to the negative terminal of the output capacitor and grounded; and the storage capacitor connected in parallel with the battery unit.

[0016] Optionally, the backup power circuit also includes a fifth and a sixth switch connected in parallel with the third and fourth switches. The third and fourth switches form a second switch group, and the fifth and sixth switches form another second switch group connected in parallel. The phase difference between the two second switch groups is 180°.

[0017] Optionally, the backup power circuit also includes a second inductor connected between the source of the fifth switch and the drain of the sixth switch and in parallel with the first inductor. The digital control module synchronously drives the third and fourth switches to conduct alternately, and the fifth and sixth switches to conduct alternately.

[0018] Optionally, it also includes a two-bus control circuit connected between the output of the power module and the input of the lighting load. The two-bus control circuit is communicatively connected to the digital control module, enabling bidirectional communication between the lighting load and the digital control module.

[0019] Optionally, it also includes a main control module that communicates with the digital control module, and a two-bus control circuit that communicates with the main control module.

[0020] The beneficial effects of this invention are as follows: By connecting a digital control module to the output of the signal detection module, the main power unit, and the backup power unit respectively, this invention can switch the power supply status of the main power unit and the backup power unit and adjust their electrical parameters based on the electrical parameters detected by the signal detection module and by controlling the conduction states of the first and second switching transistor groups. Compared with the prior art, this invention adopts global digital control to realize circuit power conversion and can also control the rapid switching between the main power unit and the backup power unit, ensuring reliable circuit operation. Attached Figure Description

[0021] Figure 1 This is the overall flowchart of the centralized power supply circuit for emergency lighting of this utility model.

[0022] Figure 2 This is a flowchart illustrating the specific process of the centralized power supply circuit for emergency lighting in this utility model.

[0023] Figure 3 This is a detailed flowchart of another embodiment of the centralized power supply circuit for emergency lighting of this utility model.

[0024] Figure 4 This is the circuit diagram of the centralized power supply circuit for emergency lighting of this utility model.

[0025] Figure 5 This is a circuit diagram of another embodiment of the centralized power supply circuit for emergency lighting of this utility model.

[0026] Figure 6 This is a schematic diagram of the digital control module of this utility model.

[0027] Figure label:

[0028] 10-Power supply module; 11-Main power unit; 111-Filtering circuit; 112-Main power circuit; 12-Backup power unit; 121-Battery unit; 122-Backup power circuit; 20-Signal detection module; 30-Digital control module; 40-Lighting load; 50-Two-bus control circuit; 60-Main control module. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please see Figures 1-6 As shown, this utility model discloses an emergency lighting centralized power supply circuit based on digital power management, including: a power module 10, a signal detection module 20 connected to the power module 10, and a digital control module 30 connected to the output terminal of the signal detection module 20 and the power module 10 respectively. The digital control module 30 can adjust the power supply state of the power module 10 to supply power to the lighting load 40 based on the electrical parameters of the power module 10 detected by the signal detection module 20, and adjust the electrical parameters of the power module 10 to realize circuit power conversion. By adopting global digital control, reliable circuit operation is ensured.

[0031] Specifically, the power module 10 includes a main power unit 11 and a backup power unit 12 connected to the output of the main power unit 11. The input of the main power unit 11 is preferably connected to mains power, so that it can supply power to the backup power unit 12 and the lighting load 40. The main power unit 11 and the backup power unit 12 can be switched to supply power to both the lighting load 40 and the digital control module 30. A signal detection module 20 is connected to both the main power unit 11 and the backup power unit 12, and is used to detect the electrical parameters of the main power unit 11 and the backup power unit 12.

[0032] The digital control module 30 is connected to the output of the signal detection module 20, the main power unit 11, and the backup power unit 12. Based on the electrical parameters detected by the signal detection module 20, the digital control module 30 switches the power supply status of the main power unit 11 and the backup power unit 12 to power the lighting load 40, and adjusts the electrical parameters of the main power unit 11 and the backup power unit 12. In this embodiment, the main power unit 11 and the backup power unit 12 achieve power conversion under the control of the digital control module 30, mainly including two power supplies: AC / DC conversion for the main power supply and DC / DC conversion for the backup power supply.

[0033] It should be noted that the digital control module 30 controls the power supply status of the main power unit 11 and the backup power unit 12. That is, when the main power unit 11 loses power, the digital control module 30 can automatically and quickly switch the backup power unit 12 to supply power to the lighting load 40. It can also manually switch the main power unit 11 and the backup power unit 12 to supply power to the lighting load 40 when needed. The digital control module 30 is also used to detect the mains power to determine its presence and voltage, and to determine if the mains power is abnormal.

[0034] like Figure 2 and Figure 4 As shown, the main power unit 11 includes a filter circuit 111 and a main power circuit 112 connected to the filter circuit 111. The filter circuit 111 includes an EMC surge protection circuit and a rectifier filter circuit to suppress electromagnetic interference, prevent surges from damaging other equipment in the circuit, and convert AC power into smoother DC power. The main power circuit 112 is preferably an LLC circuit. The main power circuit 112 includes a first switching transistor group that controls its on or off state, a resonant circuit connected to the first switching transistor group, and a transformer (not labeled).

[0035] In this embodiment, the first switching transistor group includes a first switching transistor Q1 and a second switching transistor Q2 connected in series. The resonant circuit and the transformer are connected between the source of the first switching transistor Q1 and the drain of the second switching transistor Q2.

[0036] Specifically, the resonant circuit includes a resonant inductor Lr connected between the source of the first switching transistor Q1 and the drain of the second switching transistor Q2, a magnetizing inductor Lm connected in parallel with the second switching transistor Q2, and a resonant capacitor Cr connected to the source of the second switching transistor Q2. A transformer is connected to the output of the resonant circuit. The source of the second switching transistor Q2 is grounded, and the gates of the first switching transistor Q1 and the second switching transistor Q2 are connected to the output of the digital control module 30 through a driver chip (not shown) and are controlled by the digital control module 30.

[0037] The backup power unit 12 includes a backup power circuit 122 and a battery cell 121 connected to and charged and discharged through the backup power circuit 122. The backup power circuit 122 includes one or more parallel sets of second switching transistors for controlling its on / off state, and a first inductor L1 and a storage capacitor C3 connected to the second switching transistors. In one embodiment of the present invention, the backup power circuit 122 includes a set of second switching transistors, which includes a third switching transistor Q3 and a fourth switching transistor Q4 connected in series. The first inductor L1 and the storage capacitor C3 are connected between the source of the third switching transistor Q3 and the drain of the fourth switching transistor Q4.

[0038] Specifically, one end of the first inductor L1 is connected between the source of the third switch Q3 and the drain of the fourth switch Q4, and the other end is connected to the battery unit 121. The storage capacitor C3 is connected in parallel with the fourth switch Q4 and the battery unit 121. In this embodiment, the main power circuit 112 also includes an output capacitor Cout connected to the secondary side of the transformer, and the backup power circuit 122 is connected in parallel with the output capacitor Cout. The drain of the third switch Q3 is connected to the positive terminal of the output capacitor Cout, the gate is connected to the output terminal of the digital control module 30, and the source is connected to the drain of the fourth switch Q4. The gate of the fourth switch Q4 is connected to the output terminal of the digital control module 30, and the source is connected to the negative terminal of the output capacitor Cout and grounded. That is to say, the voltage and current output by the main power circuit 112 and the backup power circuit 122 first pass through the output capacitor Cout, so that the output voltage is stable and the current fluctuation is smoothed, and then the power is supplied to the lighting load 40.

[0039] Optionally, the electrical parameters of the main power circuit 112 include its input / output voltage and / or input / output current. The signal detection module 20 includes a current transformer and a resistor divider circuit (not shown) connected to the main power circuit 112, used to detect the input / output voltage and input / output current of the main power circuit 112. The current transformer is preferably connected in series with a resonant circuit. Based on the detected input / output voltage and / or input / output current of the main power circuit 112, the digital control module 30, using power soft-switching technology, drives the first switch Q1 and the second switch Q2 to conduct alternately, so that the main power circuit 112 supplies power to the lighting load 40; or, drives the third switch Q3 and the fourth switch Q4 to conduct alternately, so that the backup power circuit 122 supplies power to the lighting load 40.

[0040] In other words, when the electrical parameters of the main power circuit 112 are normal, i.e., when mains power is available, the digital control module 30 drives the first switch Q1 and the second switch Q2 to conduct alternately, and the main power unit 11 supplies power to the lighting load 40. When the electrical parameters of the main power circuit 112 are abnormal, i.e., when mains power is unavailable, the digital control module 30 drives the first switch Q1 and the second switch Q2 to turn off, and the third switch Q3 and the fourth switch Q4 to conduct alternately, and the battery unit 121 in the backup power unit 12 discharges to supply power to the lighting load 40.

[0041] The electrical parameters of the backup power unit 12 mainly include the voltage, current, and temperature of the battery unit 121. When the main power circuit 112 supplies power to the lighting load 40, the digital control module 30 also drives the third switch Q3 and the fourth switch Q4 to alternately turn on or off based on the detected voltage, current, and temperature of the battery unit 121, so that the main power circuit 112 and the backup power circuit 122 charge or stop charging the battery unit 121.

[0042] Optionally, the signal detection module 20 also includes a thermistor (not shown) connected to the backup power circuit 122, so that the signal detection module 20 can detect the temperature of the battery cell 121.

[0043] Furthermore, the digital control module 30 also controls the conduction time and switching frequency of the first switch Q1 and the second switch Q2 through a software control algorithm to adjust the input / output voltage and input / output current of the main power circuit 112, thereby achieving the purpose of main power conversion. Of course, the digital control module 30 can also adjust the input / output voltage and input / output current of the main power circuit 112 by adjusting the duty cycle to achieve the purpose of main power conversion; this is not a limitation.

[0044] like Figure 2 and Figure 3 As shown, the digital control module 30 can sample the voltage, current, and temperature of the battery cell 121 to protect the charging and discharging of the battery cell 121 and realize battery management. Specifically, when the voltage of the battery cell 121 is too low, the digital control module 30 can control the main power circuit 112 to charge the battery cell 121 through the backup power circuit 122, and stop charging when the battery voltage reaches a certain value, the battery cell 121 temperature is too high, or the ambient temperature of the battery cell 121 is too low. When the battery cell 121 is discharging, the digital control module 30 can control the battery cell 121 to stop discharging when the discharge reaches a certain value. In addition, the digital control module 30 can also start the fan to dissipate heat from the battery cell 121 when the battery cell 121 temperature is too high.

[0045] Optionally, the backup power circuit 122 is a bidirectional circuit, that is, it is preferably a Buck circuit when charging the battery unit 121, and preferably a Boost circuit when supplying power to the lighting load 40. Specifically, when the backup power circuit 122 is in a step-down state (corresponding to...), Figure 4 and Figure 5 When the direction is from left to right, the digital control module 30 can control the main power unit 11 to charge the battery unit 121; when the backup power circuit 122 is in boost mode (corresponding to...), ... Figure 4 and Figure 5 When the direction is from right to left, the battery unit 121 discharges to supply power to the lighting load 40.

[0046] In another embodiment of this utility model, the backup power circuit 122 includes two sets of second switching transistors connected in parallel, which can shunt current when the power supply is large. For example... Figure 5As shown, the backup power circuit 122 adopts a two-way parallel connection, and the current sharing output of the two channels is realized through the digital control module 30. Specifically, the backup power circuit 122 also includes a fifth switch Q5 and a sixth switch Q6 connected in parallel with the third switch Q3 and the fourth switch Q4, and a second inductor L2 connected between the source of the fifth switch Q5 and the drain of the sixth switch Q6 and connected in parallel with the first inductor L1. The digital control module 30 synchronously drives the third switch Q3 and the fourth switch Q4 to conduct alternately, and the fifth switch Q5 and the sixth switch Q6 to conduct alternately, and controls the conduction time and switching frequency of the third switch Q3, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6. At this time, the third switch Q3 and the fourth switch Q4, and the fifth switch Q5 and the sixth switch Q6 constitute two sets of parallel second switch groups.

[0047] In this embodiment, the third switch Q3 and the fourth switch Q4 form a second switch group, and the fifth switch Q5 and the sixth switch Q6 form another second switch group. The phase difference between the two second switch groups is 180°.

[0048] Preferably, the digital control module 30 further controls the conduction time and switching frequency of the third switch Q3 and the fourth switch Q4 through a software control algorithm to adjust the input / output voltage and input / output current of the backup power circuit 122, thereby achieving the purpose of backup power conversion. Specifically, the signal detection module 20 includes a Hall element and a resistor divider circuit (not shown) connected to the backup power circuit 122, used to detect the input / output voltage and input / output current of the backup power circuit 122. Based on the detected input / output voltage and / or input / output current of the backup power circuit 122, the digital control module 30 drives the third switch Q3 and the fourth switch Q4 to conduct alternately using power soft-switching technology, and controls the conduction time and switching frequency of the third switch Q3 and the fourth switch Q4 through a software control algorithm to adjust the input / output voltage and input / output current of the backup power circuit 122, thereby achieving the purpose of backup power conversion. Of course, the digital control module 30 can also adjust the input / output voltage and input / output current of the backup power circuit 122 by adjusting the duty cycle to achieve the purpose of backup power conversion, which is not limited here.

[0049] In this embodiment, the digital control module 30 is provided with a target output value parameter. For example... Figure 6 As shown, by modifying software configurations such as target output value parameters, different output voltages and currents of the main power unit 11 and the backup power unit 12, and different charge and discharge current curves of the battery unit 121 can be customized, enabling remote online upgrades and making the power supply more flexible.

[0050] Preferably, a relay is also provided between the main power circuit 112 and the backup power circuit 122. For example... Figure 4 and Figure 5 As shown, under normal circumstances, the relay remains conductive, providing fault protection. This invention uses a digital control module 30 to drive the switching of the first switch Q1, second switch Q2, third switch Q3, fourth switch Q4, fifth switch Q5, and sixth switch Q6, thus implementing circuit switching via software. In the event of a software fault, the relay can disconnect the main power circuit 112 and the backup power circuit 122 via hardware. This invention, through dual protection of software and hardware, ensures reliable circuit operation.

[0051] like Figures 2-5 As shown, the emergency lighting centralized power supply circuit based on digital power management of this utility model also includes a two-bus control circuit 50 connected between the output terminal of the power module 10 and the input terminal of the lighting load 40. The two-bus control circuit 50 can realize synchronous conduction of power and communication. The two-bus control circuit 50 is communicatively connected to the digital control module 30, enabling bidirectional communication between the lighting load 40 and the digital control module 30. There are multiple lighting loads 40, and the output terminal of the two-bus control circuit 50 outputs multiple times to multiple lighting loads 40, realizing centralized control of the lighting loads 40 through the two-bus control circuit 50. Both the power module 10 and the two-bus control circuit 50 are controlled by the digital control module 30. Preferably, the digital control module 30 is also connected to a host computer and a display screen. The digital control module 30 executes the instructions sent by the host computer and transmits data with the host computer, facilitating fault reporting.

[0052] Of course, in other alternative embodiments, the dual-bus control circuit 50 can be independently connected to the main control module 60. The main control module 60 is connected to the digital control module 30. The host computer and the display screen are connected to the main control module 60. The power supply module 10 and the dual-bus control circuit 50 are controlled by the digital control module 30 and the main control module 60, respectively.

[0053] by Figure 5Taking an example, the operating principle of the centralized power supply circuit for emergency lighting is explained in detail: When the signal detection module 20 detects the presence of mains power, 220V AC power is input. Under the action of common mode inductor and filter capacitor, surge protection and filtering are performed. The cathodes of diode D1 and D2 are connected to form the positive terminal of DC output, and the anodes of diode D3 and D4 are connected to form the negative terminal of DC output. The input capacitor Cin filters the input DC power. The filtered DC power enters the main power circuit 112. The digital control module 30 drives the first switch Q1 and the second switch Q2 to conduct alternately. The DC power passes through the resonant circuit and the transformer. Then, diodes D5 and D6 and the output capacitor Cout rectify and filter the DC power output by the transformer again. At this time, the DC voltage output by the main power circuit 112 is 42V, which supplies power to the lighting load 40.

[0054] Meanwhile, the digital control module 30 also monitors the voltage, current, and temperature of the battery cell 121. When the voltage of the battery cell 121 is below 20V, the digital control module 30 controls the main power circuit 112 to charge the battery cell 121: first, it drives the third switch Q3 to conduct and the fourth switch Q4 to turn off, causing the first inductor L1 to store energy, and the storage capacitor C3 to charge and simultaneously supply power to the battery cell 121; then... drive The third switch Q3 is turned off, and the fourth switch Q4 is turned on, releasing energy from the first inductor L1 and the storage capacitor C3 to charge the battery unit 121. Similarly, when the digital control module 30 controls the third switch Q3 and the fourth switch Q4 to conduct alternately, it also simultaneously controls the fifth switch Q5 and the sixth switch Q6 to conduct alternately. At this time, the input voltage of the backup power circuit 122 is 42V, while the output voltage supplying power to the battery unit 121 drops to 20-28V. When the digital control module 30 detects that the voltage of the battery unit 121 has reached its own capacity, that is, when the voltage of the battery unit 121 reaches 28V, it controls the third switch Q3, the fourth switch Q4, the fifth switch Q5, and the sixth switch Q6 to turn off, stopping the charging of the battery unit 121.

[0055] When the signal detection module 20 detects the absence of mains power, the digital control module 30 controls the first switch Q1 and the second switch Q2 to disconnect, and first drives the fourth switch Q4 to conduct while the third switch Q3 disconnects. At this time, the battery unit 121 discharges, the first inductor L1 stores energy, and the storage capacitor C3 charges while simultaneously supplying power to the lighting load 40 through the output capacitor Cout. Then, the third switch Q3 is driven to conduct, and the fourth switch Q4 is disconnected. At this time, the first inductor L1 and the storage capacitor C3 release energy and supply power to the lighting load 40 through the output capacitor Cout. The fifth switch Q5 and the sixth switch Q6 are similarly used for current shunting: that is, when the digital control module 30 controls the third switch Q3 and the fourth switch Q4 to conduct alternately, it also synchronously controls the fifth switch Q5 and the sixth switch Q6 to conduct alternately. At this time, the input voltage of the backup power circuit 122 is 20-28V, i.e., the battery voltage, and the output voltage is boosted to 42V to supply power to the lighting load 40.

[0056] An emergency lighting control method is also provided, applied to the aforementioned centralized power supply circuit for emergency lighting, comprising the following steps:

[0057] Detect the electrical parameters of the main power unit 11 and the backup power unit 12;

[0058] Based on the electrical parameters of the main power unit 11, the first switch group and / or the second switch group are turned on / off, and the main power unit 11 or the backup power unit 12 supplies power to the lighting load 40.

[0059] The electrical parameters of the battery unit 121, namely the voltage, current and temperature of the battery unit 121, are adjusted based on the electrical parameters of the backup power unit 12.

[0060] In summary, this invention connects the digital control module 30 to the output of the signal detection module 20, the main power unit 11, and the backup power unit 12. Based on the electrical parameters detected by the signal detection module 20, the digital control module 30 controls the first and / or second switching transistor groups to turn on / off, thereby switching the power supply status of the main power unit 11 and the backup power unit 12 and adjusting their electrical parameters. Compared to existing technologies, this invention employs global digital control, providing comprehensive fault detection and judgment functions for each circuit. Furthermore, the digital control module enables unified management of the switch control timing, allowing for seamless switching between main and backup power, ensuring reliable circuit operation.

[0061] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model.

Claims

1. An emergency lighting centralized power supply circuit based on digital power management, characterized in that, include: The power module (10) includes a main power unit (11) and a backup power unit (12) connected to the output terminal of the main power unit (11) to supply power to the lighting load (40); The signal detection module (20) is connected to the main power unit (11) and the backup power unit (12) respectively, and is used to detect the electrical parameters of the main power unit (11) and the backup power unit (12); The digital control module (30) is connected to the output terminal of the signal detection module (20), the main power unit (11), and the backup power unit (12), respectively. The main power unit (11) includes a first switch group that controls its conduction, and the backup power unit (12) includes one or more parallel second switch groups that control its conduction. The digital control module (30) switches the power supply status of the main power unit (11) and the backup power unit (12) and adjusts their electrical parameters by controlling the conduction status of the first switch group and the second switch group based on the electrical parameters detected by the signal detection module (20).

2. The emergency lighting centralized power supply circuit according to claim 1, characterized in that: The first switch group includes a first switch and a second switch connected in series. The main power unit (11) also includes a resonant circuit and a transformer connected between the source of the first switch and the drain of the second switch.

3. The emergency lighting centralized power supply circuit according to claim 2, characterized in that: The backup power unit (12) includes a backup power circuit (122) and a battery cell (121) that is charged / discharged through the backup power circuit (122). The backup power circuit (122) includes a third switch and a fourth switch connected in series, as well as a first inductor and a storage capacitor connected between the source of the third switch and the drain of the fourth switch. The third switch and the fourth switch constitute a second switch group.

4. The emergency lighting centralized power supply circuit according to claim 3, characterized in that: The electrical parameters include the input / output voltage and / or input / output current of the main power unit (11). Based on the detected electrical parameters of the main power unit (11), the digital control module (30) drives the first switch and the second switch to conduct alternately, so that the main power unit (11) supplies power to the lighting load (40); or, drives the third switch and the fourth switch to conduct alternately, so that the backup power circuit (122) supplies power to the lighting load (40).

5. The emergency lighting centralized power supply circuit according to claim 4, characterized in that: The electrical parameters also include the voltage and / or current of the battery cell (121). When the main power unit (11) supplies power to the lighting load (40), the digital control module (30) drives the third switch and the fourth switch to alternately turn on or off based on the detected voltage and / or current of the battery cell (121), so that the main power unit (11) and the backup power circuit (122) can charge or stop charging the battery cell (121).

6. The emergency lighting centralized power supply circuit according to claim 3, characterized in that: The main power unit (11) also includes an output capacitor connected to the secondary side of the transformer. The backup power circuit (122) is connected in parallel with the output capacitor. The drain of the third switching transistor is connected to the positive terminal of the output capacitor, the gate is connected to the output terminal of the digital control module (30), and the source is connected to the drain of the fourth switching transistor. The gate of the fourth switching transistor is connected to the output terminal of the digital control module (30), and the source is connected to the negative terminal of the output capacitor and grounded. The storage capacitor is connected in parallel with the battery unit (121).

7. The emergency lighting centralized power supply circuit according to claim 3, characterized in that: The backup power circuit (122) also includes a fifth switch and a sixth switch connected in parallel with the third switch and the fourth switch. The third switch and the fourth switch constitute a second switch group, and the fifth switch and the sixth switch constitute another second switch group connected in parallel. The phase difference between the two second switch groups is 180°.

8. The emergency lighting centralized power supply circuit according to claim 7, characterized in that: The backup power circuit (122) further includes a second inductor connected between the source of the fifth switch and the drain of the sixth switch and in parallel with the first inductor. The digital control module (30) synchronously drives the third switch and the fourth switch to conduct alternately, and the fifth switch and the sixth switch to conduct alternately.

9. The emergency lighting centralized power supply circuit according to claim 1, characterized in that: It also includes a two-bus control circuit (50) connected between the output terminal of the power module (10) and the input terminal of the lighting load (40). The two-bus control circuit (50) is communicatively connected to the digital control module (30) so that the lighting load (40) and the digital control module (30) can communicate bidirectionally.

10. The emergency lighting centralized power supply circuit according to claim 9, characterized in that: It also includes a main control module (60) that is communicatively connected to the digital control module (30), and the two-bus control circuit (50) is communicatively connected to the main control module (60).

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